There is valuable diamond inside of an empty wine bottle. The wine bottle is made of glass and has a cork sealing the top. You cannot break or damage the glass in any way. You are not allowed to take the cork out of the bottle.

If you can get the diamond out of the bottle, it is yours.

How do you get the diamond out without damaging the glass or removing the cork?

Placed above, I make greater things small. Placed beside I make small things great. In matters that count, I always come first. Where others increase I keep them the same.

What am I?

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The number 1. If you put the number one above another number it turns it into a fraction. If you put it next to another number it makes the number larger. If you put things in order the number one comes first. If you multiply by one the number stays the same.

A wealthy man had an important flight the next day. Early that morning his security guard tells the man not to take the plane because he just had a dream that the plane would crash. The security guard then leaves as it is the end of his shift.

The wealthy man took the advice of his security guard and traveled by train instead. Once he arrives at his destination, he learns the plane did in fact crash. He then fires his security guard.

You have a fox, a chicken and a sack of grain. You must cross a river with only one of them at a time.

If you leave the fox with the chicken he will eat it; if you leave the chicken with the grain he will eat it.

How can you get all three across safely?

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Take the chicken over first. Go back and bring the grain next, but instead of leaving the chicken with the grain, come back with the chicken. Leave the chicken on the first side and take the fox with you. Leave it on the other side with the grain. Finally, go back over and get the chicken and bring it over.